.box1 {
  width: 100px;
  height: 100px;
  background-image: url("../images/1.jpeg");
}

.box2 {
  width: 100px;
  height: 100px;
  background-image: url("../images/2.png");
}

.box3 {
  width: 100px;
  height: 100px;
  background-image: url("../images/3.gif");
}
